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StopWatch not to get time if it is created for statistics and it is disabled

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Summary: Currently, even if statistics is not enabled, StopWatch only for the stats still gets the time of the day, which is wasteful. This patch adds a new option to StopWatch to disable this get in this case.

Test Plan: make all check

Reviewers: dhruba, haobo, igor

CC: leveldb

Differential Revision: https://reviews.facebook.net/D14703
This commit is contained in:
Siying Dong 2014-01-07 14:33:15 -08:00
parent 12b6d2b839
commit 5575316350
2 changed files with 8 additions and 7 deletions
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10
db/db_impl.cc
View File

@ -2091,11 +2091,11 @@ Status DBImpl::FinishCompactionOutputFile(CompactionState* compact,
if (s.ok() && !options_.disableDataSync) {
if (options_.use_fsync) {
StopWatch sw(env_, options_.statistics.get(),
COMPACTION_OUTFILE_SYNC_MICROS);
COMPACTION_OUTFILE_SYNC_MICROS, false);
s = compact->outfile->Fsync();
} else {
StopWatch sw(env_, options_.statistics.get(),
COMPACTION_OUTFILE_SYNC_MICROS);
COMPACTION_OUTFILE_SYNC_MICROS, false);
s = compact->outfile->Sync();
}
}
@ -2724,7 +2724,7 @@ Status DBImpl::GetImpl(const ReadOptions& options,
bool* value_found) {
Status s;
StopWatch sw(env_, options_.statistics.get(), DB_GET);
StopWatch sw(env_, options_.statistics.get(), DB_GET, false);
SequenceNumber snapshot;
if (options.snapshot != nullptr) {
snapshot = reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_;
@ -2793,7 +2793,7 @@ std::vector<Status> DBImpl::MultiGet(const ReadOptions& options,
const std::vector<Slice>& keys,
std::vector<std::string>* values) {
StopWatch sw(env_, options_.statistics.get(), DB_MULTIGET);
StopWatch sw(env_, options_.statistics.get(), DB_MULTIGET, false);
SequenceNumber snapshot;
std::vector<MemTable*> to_delete;
@ -2944,7 +2944,7 @@ Status DBImpl::Write(const WriteOptions& options, WriteBatch* my_batch) {
w.disableWAL = options.disableWAL;
w.done = false;
StopWatch sw(env_, options_.statistics.get(), DB_WRITE);
StopWatch sw(env_, options_.statistics.get(), DB_WRITE, false);
mutex_.Lock();
writers_.push_back(&w);
while (!w.done && &w != writers_.front()) {

5
util/stop_watch.h
View File

@ -15,9 +15,10 @@ class StopWatch {
explicit StopWatch(
Env * const env,
Statistics* statistics = nullptr,
const Histograms histogram_name = DB_GET) :
const Histograms histogram_name = DB_GET,
bool auto_start = true) :
env_(env),
start_time_(env->NowMicros()),
start_time_((!auto_start && !statistics) ? 0 : env->NowMicros()),
statistics_(statistics),
histogram_name_(histogram_name) {}